Removable anvil-contact and bridge-support for electric vibrators.



No. 821,028. PATENTED MAY 22, 1906.

W. E. DOW. REMOVABLE ANVIL GONTAGT AND BRIDGE SUPPORT FOR ELECTRICVIBRATORS.

APPLICATION FILED MARJS, 1905.

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BEST AVAILABLE com UNITED -sTATEs PATENT OFFICE.

WILLARD E. DOW, OF BRAINTREE, MASSACHUSETTS.

REMOVABLE ANVlL-CONTACT AND BRIDGE-SUPPORT FOR ELECTRIC VIBRATORS.

Specification of Letters Patent.

Patented May 22, 1906.

Application filed March 13, 1905. Serial No. 249,822.

To all whom, it may concern:

.Be it known that I, WILLARD E. Dow, a citizen' of the United States,residing at Braintree, in the county of Norfolk and State ofMassachusetts, have invented an Improvement in a Removable Anvil-Contactand Brid e-Support for Electric Vibrators, of which the followingdescription, in connection with the accompanying drawings, is aspecification, like numerals on the drawings representing like parts.

My invention relates to electric vibrators for operatinginduction-coils, and has for its object the rovision of means forremoving the adjusta le contact or anvil, so called, for inspection orcleaning without changing its adjustment in any way. To this end Iprovide the contact member (a usual screwcontact being commonlyemployed) with a holder which cooperates with the supportingbridge toremovably lock said contact rigidly in place and yet permit the instantremoval of said contact and holder Without disturbing their relativeadjustment. In other words, the adjustment of the contact takes placewith reference to the holder, and the holder and bridge haveinterlocking means or other devices or formation for permitting theholder to be instantly put in place or removed therefrom withoutdisturbing said adjustment. In the preferred embodiment of my inventionsaid holder and contact are maintained in locked position relatively tothe bridge by yielding means.

My invention is especially adapted to automobiles.

In the accompanying drawings, in which I have shown two embodiments ofmy invention, Figure 1 represents conventionally in side elevation aninduction-coil and its vibrating hammer provided with one form of myremovable brid e-piece and contact, a portion of the bri ge-piece beingbroken away for showing the internal relative arran ement of parts. Fig.2 is a top plan view of t e, contact-holder. Fig. 3 is a centrallongitudinal sectional view of the engaging-end of the brid e-piece.Fig. 4 is an isometric view of the ridge-piece looking downwardly at therear end thereof; and Figs. 5, 6, and 7 are enlarged views of adifferent or modified construction, Fig. 5 showing the holder, contact,

For convenience of illustration I have merely indicated conventionally acoil 1, provided with a vibrating hammer or contactbreaker 2 foroperating between the core end 3 of the coil and an opposite contact 4.

The contact 4 is shown as a threaded post or'screw 5, operated by athumb-nut 6 in usual manner. This screw 5 has threaded engagement at 7(see Fig. 2) with ablock-like split holder 8, which may have aclampingscrew 9 for binding the screw 5 in any given adjustment in saidholder. Cooperating with this holder 8 is a bridge-piece 10, (which, itwill be understood, will be secured to an insulating-slab or anyconvenient portion of the coil in the same manner as the ordinarybridge,) having two upwardly and forwardly projecting arms 11' 12, atwhose extreme forward lower corners are inwardly-projecting ledges 13and rearwardly therefrom a crossbar or retaining-stud 14. Beneath saidstud 14 is a leaf-spring 15, shown as secured by a nut 16 to projectforwardly and upwardly just beneath the stud 14. The rear end of theholder is peculiarly shaped, as is clearly shown in Fig. 1, having anangular notch or slot 17 tendin obliquely downward a short distance andthence obliquely rearwardly, so'

as to form a retaining-pocket for the stud 14. The extreme rear end 18of the holder is a j proximately flat and at right angles to t 1egeneral direction of the holder and terminates in a depending portion 19for wedging against the free end of the spring 15, so as to retain theholder not only in immovable engagement with the stud 14, but also incontact with the supporting-ledges 13.

From the foregoing description it will readily be understood thatwhenever the user of the vibrator desires to inspect the platinum pointof the contact 4 or desires to clean the same or whenever he Wishes tokill the vibrator temporarilybyplacing the contact 4 in his pocket(while leaving the automobile, for instance) he simply disengages theholdernotch 17 from the retaining-stud 14 without disturbing theadjustment of the screw-contact in its threaded-"aperture 7 in any way.In order to release the holder and its contact from the locked positionshown in Fig. 1, the user simply moves the holder 8- over to the left inthe'direction of the arrow, Fig. 1, until the shouldered inner end ofthe notch 17 can readily slide over the stud 14, whereupon the notchedend of the holder is moved forward sufliciently to disengage the notchfrom said ing the slot 26 of the bridge-piece.

stud. After having cleaned or inspected the contact-point the operatorsimply hooks the notch 17 back onto the stud 14 andshoves the free endof the holder down against the ledges 13, where it is tightly held bythe spring 15.

I am aware that it is not new to provide means for permitting thecontact to be moved into position for cleaning and inspection, thisbeing old in various patentsas, for instance, in Hard, No. 371,755, andin Palm leaf, No. 550,688and I do not, therefore, claim the same; but Ibelieve it is new to provide a removable contact-holder arranged tointerlock with the bridge-piece for permitting the instant removal ofthe contact without interfering with its adjustment means, and I believethat my invention is new in various other features which will be pointedout in the claims.

In Figs. 5 to 7 I have shown a further em bodiment of my invention, thebridge 10 hav ing its free end extending forwardly in the same shape asbefore and being longitudinally slotted to constitute two receiving-arms2O 21, having an opening 22 for receiving a tubular holder 23, threadedon its inner side 24 to receive the screw 5 of the contact 4 andprovided on its outside with projecting studs or pins 25, constituting across-bar for enter- Having insert-ed the holder 23 in the opening 22 ofthe bridge-piece sufliciently to permit the studs or pins 25 to passbeneath the latter, the holder is turned at right angles, so as to bringsaid studs into notches 27 in the under side of the bridge-piece, wherethey are held tightly by a coiled spring 28, which surrounds the tubularholder 23. The holder 23 is split at its upper end, as indicated at 29,and provided with a clamping-screw 30 for clamping the screw 5 inimmovable adjustment, acting the same as the screw 9 in thepreviously-de scribed. embodiment of my invention.

WVhen the contact or contact-point 4 and its removable support or splitholder 8 or 23 are removed from their bearing or disengagement with thebridge-piece, they thereby permanently disrupt the primary circuit ofthe induction-coil, and when replaced in their hearing they reestablishsaid primary circuit to the extent that the induction-coil is then inworking condition for automatically disrupting and reestablishing thecircuit upon the closing of said circuit by the usual interrupter orother circuit-closing device. (Not shown.)

As already intimated, I do not intend to restrict myself to theconstructional details herein shown, as my invention is capable ofvarious other embodiments and modifications without departing from thespirit and scope thereof as set forth in the following claims, taken inconnection with this description.

Having described my invention, what I claim as new, and desire to secureby Letters Patent of the United States, is

1. In an inducti0n-c0il vibrator, an adj ustable contact-point adaptedto be removed from its bearing, and replaced, without altering theadjustment.

2. In an induction-coil vibrator having an adjustable contact-point,means supporting said contact-point in a manner permitting its removaland replacement without disturbing the adjustment.

3. In a vibrator for induction-coils having an adjustable contact-point,means for disrupting and reestablishing the primary circuit, consistingof a removable support for said adjustable contact-point.

4. In an electric vibrator, a vibrating contact-breaker, a holder, acontact adjustable therein and intermittingly engaged by saidcontact-breaker, and means permitting said holder and contact to beinstantly removed or placed in position without disturbing theadjustment of said contact.

5. An electric vibrator, having a removable contactholder, a contactadjustable therein, a vibrating contact-breaker intermittingly closingand breaking the circuit through said contact, and yielding means fornormally maintaining said holder and its contact in operative position.

6. An electric vibrator, provided with a bridge having a bifurcated freeend, and a contact and its holder normally retained by said bifurcatedfree end, said holder and bridge having cooperating locking means forpermitting the instant removal of said holder and contact.

7. An electric vibrator, provided with a bridge having a bifurcated freeend, and a contact and its holder normally retained by said bifurcatedfree end, said holder and bridge having a cooperating notch and stud forremovably locking them together.

8. An electric vibrator, provided with a bridge having a l wifurcatcdfree end, and a contact and its holder normally retained by saidbifurcated free end, said holder and bridge. having a coojwrating notchand stud for removably locking them together, and a spring foryieldingly holding said notch and stud in locking position.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses. 1

IVILLARD E. DOW.

Witnesses:

MAY W. BUCHANAN, CARLOTTA NIX.

